From 4acc6e36e339e2022170136927cccda9060b930f Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Sun, 9 Jun 2024 13:04:22 +0200
Subject: [PATCH] Fix textstyle-update handling in mathed

The code was expecting that all properties were specified
in the argument and not only some. Simply do not process
those properties not specified in the argument.

(cherry picked from commit afb70c905b526ec6fdc5ed66afe800fcd705b425)
---
 src/mathed/InsetMathNest.cpp | 359 ++++++++++++++++++-----------------
 1 file changed, 186 insertions(+), 173 deletions(-)

diff --git a/src/mathed/InsetMathNest.cpp b/src/mathed/InsetMathNest.cpp
index 37bbd40008..1b22e50815 100644
--- a/src/mathed/InsetMathNest.cpp
+++ b/src/mathed/InsetMathNest.cpp
@@ -518,176 +518,187 @@ void InsetMathNest::handleFont2(Cursor & cur, docstring const & arg)
 	DocIterator sel_end = cur.selectionEnd();
 	bool multiple_cells = sel_begin.idx() != sel_end.idx();
 	Font font;
-	bool b;
-	font.fromString(to_utf8(arg), b);
 	docstring im;
 	InsetMathFont const * f = asFontInset();
+	bool b;
 
-	switch(font.fontInfo().family()) {
-	case ROMAN_FAMILY:
-		if (!f || (f->name() != "textrm" && f->name() != "mathrm"))
-			im = currentMode() != MATH_MODE ? from_ascii("textrm")
-							: from_ascii("mathrm");
-		break;
-	case SANS_FAMILY:
-		if (!f || (f->name() != "textsf" && f->name() != "mathsf"))
-			im = currentMode() != MATH_MODE ? from_ascii("textsf")
-							: from_ascii("mathsf");
-		break;
-	case TYPEWRITER_FAMILY:
-		if (!f || (f->name() != "texttt" && f->name() != "mathtt"))
-			im = currentMode() != MATH_MODE ? from_ascii("texttt")
-							: from_ascii("mathtt");
-		break;
-	case SYMBOL_FAMILY:
-	case CMR_FAMILY:
-	case CMSY_FAMILY:
-	case CMM_FAMILY:
-	case CMEX_FAMILY:
-	case MSA_FAMILY:
-	case MSB_FAMILY:
-	case DS_FAMILY:
-	case EUFRAK_FAMILY:
-	case RSFS_FAMILY:
-	case STMARY_FAMILY:
-	case WASY_FAMILY:
-	case ESINT_FAMILY:
-	case INHERIT_FAMILY:
-	case IGNORE_FAMILY:
-		break;
-	}
-	if (!im.empty()) {
-		handleNest(cur, createInsetMath(im, cur.buffer()));
-		im.clear();
-		include_previous_change = true;
-	}
+	// Return if nothing has been set
+	if (!font.fromString(to_utf8(arg), b))
+		return;
 
-	switch(font.fontInfo().series()) {
-	case MEDIUM_SERIES:
-		if (!f || (f->name() != "textmd" && f->name() != "mathrm"))
-			im = currentMode() != MATH_MODE ? from_ascii("textmd")
-							: from_ascii("mathrm");
-		break;
-	case BOLD_SERIES:
-		if (!f || (f->name() != "textbf" && f->name() != "mathbf"))
-			im = currentMode() != MATH_MODE ? from_ascii("textbf")
-							: from_ascii("boldsymbol");
-		break;
-	case INHERIT_SERIES:
-	case IGNORE_SERIES:
-		break;
-	}
-	if (!im.empty()) {
-		if (multiple_cells) {
-			cur.setCursor(sel_begin);
-			cur.idx() = 0;
-			cur.pos() = 0;
-			cur.resetAnchor();
-			cur.setCursor(sel_end);
-			cur.pos() = cur.lastpos();
-			cur.setSelection();
-		} else if (include_previous_change && selection) {
-			cur.setSelection();
+	if (support::contains(arg, from_ascii("family"))) {
+		switch(font.fontInfo().family()) {
+		case ROMAN_FAMILY:
+			if (!f || (f->name() != "textrm" && f->name() != "mathrm"))
+				im = currentMode() != MATH_MODE ? from_ascii("textrm")
+								: from_ascii("mathrm");
+			break;
+		case SANS_FAMILY:
+			if (!f || (f->name() != "textsf" && f->name() != "mathsf"))
+				im = currentMode() != MATH_MODE ? from_ascii("textsf")
+								: from_ascii("mathsf");
+			break;
+		case TYPEWRITER_FAMILY:
+			if (!f || (f->name() != "texttt" && f->name() != "mathtt"))
+				im = currentMode() != MATH_MODE ? from_ascii("texttt")
+								: from_ascii("mathtt");
+			break;
+		case SYMBOL_FAMILY:
+		case CMR_FAMILY:
+		case CMSY_FAMILY:
+		case CMM_FAMILY:
+		case CMEX_FAMILY:
+		case MSA_FAMILY:
+		case MSB_FAMILY:
+		case DS_FAMILY:
+		case EUFRAK_FAMILY:
+		case RSFS_FAMILY:
+		case STMARY_FAMILY:
+		case WASY_FAMILY:
+		case ESINT_FAMILY:
+		case INHERIT_FAMILY:
+		case IGNORE_FAMILY:
+			break;
+		}
+		if (!im.empty()) {
+			handleNest(cur, createInsetMath(im, cur.buffer()));
+			im.clear();
+			include_previous_change = true;
 		}
-		handleNest(cur, createInsetMath(im, cur.buffer()));
-		im.clear();
-		include_previous_change = true;
 	}
 
-	switch(font.fontInfo().shape()) {
-	case UP_SHAPE:
-		if (!f || (f->name() != "textup" && f->name() != "mathrm"))
-			im = currentMode() != MATH_MODE ? from_ascii("textup")
-							: from_ascii("mathrm");
-		break;
-	case ITALIC_SHAPE:
-		if (!f || (f->name() != "textit" && f->name() != "mathit"))
-			im = currentMode() != MATH_MODE ? from_ascii("textit")
-							: from_ascii("mathit");
-		break;
-	case SLANTED_SHAPE:
-		if (!f || f->name() != "textsl")
-			im = currentMode() != MATH_MODE ? from_ascii("textsl")
-							: docstring();
-		break;
-	case SMALLCAPS_SHAPE:
-		if (!f || f->name() != "textsc")
-			im = currentMode() != MATH_MODE ? from_ascii("textsc")
-							: docstring();
-		break;
-	case INHERIT_SHAPE:
-	case IGNORE_SHAPE:
-		break;
-	}
-	if (!im.empty()) {
-		if (multiple_cells) {
-			cur.setCursor(sel_begin);
-			cur.idx() = 0;
-			cur.pos() = 0;
-			cur.resetAnchor();
-			cur.setCursor(sel_end);
-			cur.pos() = cur.lastpos();
-			cur.setSelection();
-		} else if (include_previous_change && selection) {
-			cur.setSelection();
+	if (support::contains(arg, from_ascii("series"))) {
+		switch(font.fontInfo().series()) {
+		case MEDIUM_SERIES:
+			if (!f || (f->name() != "textmd" && f->name() != "mathrm"))
+				im = currentMode() != MATH_MODE ? from_ascii("textmd")
+								: from_ascii("mathrm");
+			break;
+		case BOLD_SERIES:
+			if (!f || (f->name() != "textbf" && f->name() != "mathbf"))
+				im = currentMode() != MATH_MODE ? from_ascii("textbf")
+								: from_ascii("boldsymbol");
+			break;
+		case INHERIT_SERIES:
+		case IGNORE_SERIES:
+			break;
+		}
+		if (!im.empty()) {
+			if (multiple_cells) {
+				cur.setCursor(sel_begin);
+				cur.idx() = 0;
+				cur.pos() = 0;
+				cur.resetAnchor();
+				cur.setCursor(sel_end);
+				cur.pos() = cur.lastpos();
+				cur.setSelection();
+			} else if (include_previous_change && selection) {
+				cur.setSelection();
+			}
+			handleNest(cur, createInsetMath(im, cur.buffer()));
+			im.clear();
+			include_previous_change = true;
 		}
-		handleNest(cur, createInsetMath(im, cur.buffer()));
-		im.clear();
-		include_previous_change = true;
 	}
 
-	switch(font.fontInfo().size()) {
-	case TINY_SIZE:
-		im = from_ascii("tiny");
-		break;
-	case SCRIPT_SIZE:
-		im = from_ascii("scriptsize");
-		break;
-	case FOOTNOTE_SIZE:
-		im = from_ascii("footnotesize");
-		break;
-	case SMALL_SIZE:
-		im = from_ascii("small");
-		break;
-	case NORMAL_SIZE:
-		im = from_ascii("normalsize");
-		break;
-	case LARGE_SIZE:
-		im = from_ascii("large");
-		break;
-	case LARGER_SIZE:
-		im = from_ascii("Large");
-		break;
-	case LARGEST_SIZE:
-		im = from_ascii("LARGE");
-		break;
-	case HUGE_SIZE:
-		im = from_ascii("huge");
-		break;
-	case HUGER_SIZE:
-		im = from_ascii("Huge");
-		break;
-	case INCREASE_SIZE:
-	case DECREASE_SIZE:
-	case INHERIT_SIZE:
-	case IGNORE_SIZE:
-		break;
-	}
-	if (!im.empty()) {
-		if (multiple_cells) {
-			cur.setCursor(sel_begin);
-			cur.idx() = 0;
-			cur.pos() = 0;
-			cur.resetAnchor();
-			cur.setCursor(sel_end);
-			cur.pos() = cur.lastpos();
-			cur.setSelection();
-		} else if (include_previous_change && selection) {
-			cur.setSelection();
+	if (support::contains(arg, from_ascii("shape"))) {
+		switch(font.fontInfo().shape()) {
+		case UP_SHAPE:
+			if (!f || (f->name() != "textup" && f->name() != "mathrm"))
+				im = currentMode() != MATH_MODE ? from_ascii("textup")
+								: from_ascii("mathrm");
+			break;
+		case ITALIC_SHAPE:
+			if (!f || (f->name() != "textit" && f->name() != "mathit"))
+				im = currentMode() != MATH_MODE ? from_ascii("textit")
+								: from_ascii("mathit");
+			break;
+		case SLANTED_SHAPE:
+			if (!f || f->name() != "textsl")
+				im = currentMode() != MATH_MODE ? from_ascii("textsl")
+								: docstring();
+			break;
+		case SMALLCAPS_SHAPE:
+			if (!f || f->name() != "textsc")
+				im = currentMode() != MATH_MODE ? from_ascii("textsc")
+								: docstring();
+			break;
+		case INHERIT_SHAPE:
+		case IGNORE_SHAPE:
+			break;
+		}
+		if (!im.empty()) {
+			if (multiple_cells) {
+				cur.setCursor(sel_begin);
+				cur.idx() = 0;
+				cur.pos() = 0;
+				cur.resetAnchor();
+				cur.setCursor(sel_end);
+				cur.pos() = cur.lastpos();
+				cur.setSelection();
+			} else if (include_previous_change && selection) {
+				cur.setSelection();
+			}
+			handleNest(cur, createInsetMath(im, cur.buffer()));
+			im.clear();
+			include_previous_change = true;
+		}
+	}
+
+	if (support::contains(arg, from_ascii("size"))) {
+		switch(font.fontInfo().size()) {
+		case TINY_SIZE:
+			im = from_ascii("tiny");
+			break;
+		case SCRIPT_SIZE:
+			im = from_ascii("scriptsize");
+			break;
+		case FOOTNOTE_SIZE:
+			im = from_ascii("footnotesize");
+			break;
+		case SMALL_SIZE:
+			im = from_ascii("small");
+			break;
+		case NORMAL_SIZE:
+			im = from_ascii("normalsize");
+			break;
+		case LARGE_SIZE:
+			im = from_ascii("large");
+			break;
+		case LARGER_SIZE:
+			im = from_ascii("Large");
+			break;
+		case LARGEST_SIZE:
+			im = from_ascii("LARGE");
+			break;
+		case HUGE_SIZE:
+			im = from_ascii("huge");
+			break;
+		case HUGER_SIZE:
+			im = from_ascii("Huge");
+			break;
+		case INCREASE_SIZE:
+		case DECREASE_SIZE:
+		case INHERIT_SIZE:
+		case IGNORE_SIZE:
+			break;
+		}
+		if (!im.empty()) {
+			if (multiple_cells) {
+				cur.setCursor(sel_begin);
+				cur.idx() = 0;
+				cur.pos() = 0;
+				cur.resetAnchor();
+				cur.setCursor(sel_end);
+				cur.pos() = cur.lastpos();
+				cur.setSelection();
+			} else if (include_previous_change && selection) {
+				cur.setSelection();
+			}
+			handleNest(cur, createInsetMath(im, cur.buffer()));
+			im.clear();
+			include_previous_change = true;
 		}
-		handleNest(cur, createInsetMath(im, cur.buffer()));
-		im.clear();
-		include_previous_change = true;
 	}
 
 	InsetMathDecoration const * d = multiple_cells
@@ -765,21 +776,23 @@ void InsetMathNest::handleFont2(Cursor & cur, docstring const & arg)
 		include_previous_change = true;
 	}
 
-	if (font.fontInfo().color() != Color_inherit &&
-	    font.fontInfo().color() != Color_ignore) {
-		if (multiple_cells) {
-			cur.setCursor(sel_begin);
-			cur.idx() = 0;
-			cur.pos() = 0;
-			cur.resetAnchor();
-			cur.setCursor(sel_end);
-			cur.pos() = cur.lastpos();
-			cur.setSelection();
-		} else if (include_previous_change && selection) {
-			cur.setSelection();
+	if (support::contains(arg, from_ascii("color"))) {
+		if (font.fontInfo().color() != Color_inherit &&
+		    font.fontInfo().color() != Color_ignore) {
+			if (multiple_cells) {
+				cur.setCursor(sel_begin);
+				cur.idx() = 0;
+				cur.pos() = 0;
+				cur.resetAnchor();
+				cur.setCursor(sel_end);
+				cur.pos() = cur.lastpos();
+				cur.setSelection();
+			} else if (include_previous_change && selection) {
+				cur.setSelection();
+			}
+			handleNest(cur, MathAtom(new InsetMathColor(buffer_, true, font.fontInfo().color())));
+			include_previous_change = true;
 		}
-		handleNest(cur, MathAtom(new InsetMathColor(buffer_, true, font.fontInfo().color())));
-		include_previous_change = true;
 	}
 
 	if (selection) {