TortoiseGitMerge should redraw if font is changed

Repro steps

1. Right-click on a changed file and select Tortoisegit --> Diff
2. Click the orb menu at the upper-left corner, and select Settings.
3. Change the font, e.g., from the Courier New 10 to Consolas 14.
4. Click OK.

Expected behavior: TortoiseGitMerge should redraw the window to reflect the new font.

Actual behavior: The window remains unchanged. You have to restart TortoiseGitMerge to see the new font.

System configuration:

• TortoiseGit 1.8.16.4 (preview)
• git version 2.7.2.windows.1
• Windows 10 x64

Notes

This is especially useful for selecting a font size on a new machine. Because you're trying to select a font size that looks comfortable, you really need the immediate visual feedback.

Other Diff programs and text editors redraw immediately after changing the font, so this is the expected behavior.