Remove extra spacing around InsetCommand buttons

There is already a spacing of 2 pixels on each side of a button (e.g.
collapsed inset). There is no need to add one extra pixel for command
insets.

Fixes part of bug #10149.
(cherry picked from commit 68149e380d)

src/insets/RenderButton.cpp

@@ -51,7 +51,6 @@ void RenderButton::metrics(MetricsInfo &, Dimension & dim) const
 	else
 		fm.rectText(text_, dim.wid, dim.asc, dim.des);
 
-	dim.wid += 2;
 	dim_ = dim;
 }
 
@@ -64,9 +63,9 @@ void RenderButton::draw(PainterInfo & pi, int x, int y) const
 	font.decSize();
 
 	if (editable_) {
-		pi.pain.buttonText(x + 1, y, text_, font, renderState());
+		pi.pain.buttonText(x, y, text_, font, renderState());
 	} else {
-		pi.pain.rectText(x + 1, y, text_, font,
+		pi.pain.rectText(x, y, text_, font,
 				 Color_commandbg, Color_commandframe);
 	}
 }

status.22x

@@ -90,6 +90,7 @@ What's new
 - Shortcut preferences: don't forget to trigger the search when it is
   initialized with the previous value.
 
+- Remove extra spacing around  button insets (bug 10149).
 
 * INTERNALS