Fix tiny window when resetting zoom factor in gtk2 build

rhbz#1104064 had a couple of symptoms. The first was fixed in
6edde57862ac30e74ce6412c93a2fa925ae4ea67.

The second symptom is that displays could also become tiny when clicking 'View >
Zoom > Normal Size'. This was because VirtViewerDisplay returned early from
_display_set_zoom_level() if the zoom level was being set to the current zoom
setting. However, the calling function (_window_set_zoom_level()) also tries to
queue a resize event for itself after setting the zoom level on the display. If
the display doesn't queue a resize event for itself, its size request will only
be 50x50 during the window resize negotiation. This causes the display to become
tiny and zoomed out. Queueing a resize on the display widget ensures that it
will request the proper size during the next allocation.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/virt-viewer-display.c b/src/virt-viewer-display.c
index fc38f59..c5170c4 100644
--- a/src/virt-viewer-display.c
+++ b/src/virt-viewer-display.c
@@ -605,12 +605,19 @@ void virt_viewer_display_set_zoom_level(VirtViewerDisplay *display,
     if (zoom > MAX_ZOOM_LEVEL)
         zoom = MAX_ZOOM_LEVEL;
 
+    // For the gtk2 build, we need to queue a resize even if the zoom level
+    // hasn't changed.  This is due to the fact that VirtViewerWindow will queue
+    // a resize event for itself immediately after calling this function (in
+    // order to shrink the window to fit the new display size if necessary). If
+    // we don't queue a resize here, the window will become tiny because we will
+    // only request 50x50 during the window resize
+    virt_viewer_display_queue_resize(display);
+
     if (priv->zoom_level == zoom)
         return;
 
     priv->zoom_level = zoom;
 
-    virt_viewer_display_queue_resize(display);
     g_object_notify(G_OBJECT(display), "zoom-level");
 }