[evolution] Bug 749712 - Undo/Redo in composer doesn't work right

[Tomas Popela <tpopela src gnome org>]

commit 87a27e49205de7ab11de3ad8b979e16f0b460ae7
Author: Tomas Popela <tpopela redhat com>
Date:   Fri Dec 11 11:25:54 2015 +0100

    Bug 749712 - Undo/Redo in composer doesn't work right
    
    Implement the workaround on the Evolution side. The cause of the bug is that
    WebKit is having problems determining the right line height for some fonts and
    font sizes (the right and wrong value differ by 1). To fix this we will add an
    extra one to the final top offset. This is safe to do even for fonts and font
    sizes that don't behave badly as we will still get the right element as we use
    fonts bigger than 1 pixel.

 e-util/e-html-editor-selection.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/e-util/e-html-editor-selection.c b/e-util/e-html-editor-selection.c
index a64c939..4a2914d 100644
--- a/e-util/e-html-editor-selection.c
+++ b/e-util/e-html-editor-selection.c
@@ -1678,7 +1678,7 @@ e_html_editor_selection_get_selection_coordinates (EHTMLEditorSelection *selecti
                if (created_selection_markers)
                        e_html_editor_selection_restore (selection);
 
-               return;
+               goto workaroud;
        }
 
        element = webkit_dom_document_get_element_by_id (
@@ -1701,6 +1701,16 @@ e_html_editor_selection_get_selection_coordinates (EHTMLEditorSelection *selecti
 
        if (created_selection_markers)
                e_html_editor_selection_restore (selection);
+
+ workaroud:
+       /* Workaround for bug 749712 on the Evolution side. The cause of the bug
+        * is that WebKit is having problems determining the right line height
+        * for some fonts and font sizes (the right and wrong value differ by 1).
+        * To fix this we will add an extra one to the final top offset. This is
+        * safe to do even for fonts and font sizes that don't behave badly as we
+        * will still get the right element as we use fonts bigger than 1 pixel. */
+       *start_y += 1;
+       *end_y += 1;
 }
 
 /**