Regenerate previews after zoom (#11919)

src/Buffer.cpp

@@ -4253,6 +4253,13 @@ void Buffer::updateTitles() const
 }
 
 
+void Buffer::scheduleRedrawWorkAreas() const
+{
+	if (d->wa_)
+		d->wa_->scheduleRedraw();
+}
+
+
 void Buffer::resetAutosaveTimers() const
 {
 	if (d->gui_)

src/Buffer.h

@@ -666,6 +666,8 @@ public:
 	void setBusy(bool on) const;
 	/// Update window titles of all users.
 	void updateTitles() const;
+	/// Schedule redraw of work areas
+	void scheduleRedrawWorkAreas() const;
 	/// Reset autosave timers for all users.
 	void resetAutosaveTimers() const;
 	///

src/frontends/WorkAreaManager.cpp

@@ -62,6 +62,13 @@ void WorkAreaManager::updateTitles()
 }
 
 
+void WorkAreaManager::scheduleRedraw()
+{
+	for (WorkArea * wa : work_areas_)
+		wa->scheduleRedraw(true);
+}
+
+
 } // namespace frontend
 } // namespace lyx
 

src/frontends/WorkAreaManager.h

@@ -44,6 +44,8 @@ public:
 	/// Update window titles of all users and the external modifications
 	/// warning.
 	void updateTitles();
+	/// Schedule redraw of work areas
+	void scheduleRedraw();
 	/// If there is no work area, create a new one in the current view using the
 	/// buffer buf. Returns false if not possible.
 	bool unhide(Buffer * buf) const;

src/frontends/qt/GuiView.cpp

@@ -69,6 +69,8 @@
 #include "Toolbars.h"
 #include "version.h"
 
+#include "graphics/PreviewLoader.h"
+
 #include "support/convert.h"
 #include "support/debug.h"
 #include "support/ExceptionMessage.h"
@@ -4891,6 +4893,10 @@ void GuiView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
 					      lyxrc.currentZoom, lyxrc.defaultZoom));
 
 			guiApp->fontLoader().update();
+			// Regenerate instant previews
+			if (lyxrc.preview != LyXRC::PREVIEW_OFF
+			    && doc_buffer && doc_buffer->loader())
+				doc_buffer->loader()->refreshPreviews();
 			dr.screenUpdate(Update::ForceAll | Update::FitCursor);
 			break;
 		}

src/graphics/PreviewLoader.cpp

@@ -799,6 +799,7 @@ void PreviewLoader::Impl::finishedGenerating(pid_t pid, int retval)
 		imageReady(*nit->get());
 	}
 	finished_generating_ = true;
+	buffer_.scheduleRedrawWorkAreas();
 }