Commit: patch 9.2.0577: GTK4: window resizing issues

[Christian Brabandt]

patch 9.2.0577: GTK4: window resizing issues

Commit: https://github.com/vim/vim/commit/568daf65b82173605aeecf799ebe46cec54d77a8
Author: Foxe Chen <chen...@gmail.com>
Date: Sun May 31 20:09:52 2026 +0000

patch 9.2.0577: GTK4: window resizing issues

Problem: GTK4: window size does not account for client-side decorations
Solution: Compute the client side decoration height from
gui_resize_shell() (Foxe Chen)

fixes: #20365
closes: #20388

Signed-off-by: Foxe Chen <chen...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/gui.c b/src/gui.c
index 8cf4c8fa4..b0235eec2 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -1594,6 +1594,9 @@ again:

// Flush pending output before redrawing
out_flush();
+#if defined(FEAT_GUI_GTK) && defined(USE_GTK4)
+ gui_gtk_init_decor_height();
+#endif

gui.num_cols = (pixel_width - gui_get_base_width()) / gui.char_width;
gui.num_rows = (pixel_height - gui_get_base_height()) / gui.char_height;
diff --git a/src/gui.h b/src/gui.h
index d1e5d2d5c..609100a17 100644
--- a/src/gui.h
+++ b/src/gui.h
@@ -475,6 +475,9 @@ typedef struct Gui
char *rsrc_input_method;
char *rsrc_preedit_type_name;
#endif
+#if defined(FEAT_GUI_GTK) && defined(USE_GTK4)
+ int decor_height;
+#endif
} gui_T;

extern gui_T gui; // this is defined in gui.c
diff --git a/src/gui_gtk4.c b/src/gui_gtk4.c
index 1596f19e5..e7bbd9ad5 100644
--- a/src/gui_gtk4.c
+++ b/src/gui_gtk4.c
@@ -816,6 +816,28 @@ gui_mch_settitle(char_u *title, char_u *icon UNUSED)

static int in_set_shellsize = FALSE;

+/*
+ * Get height of window decorations, that we cannot determine directly. For
+ * example, the GtkHeaderBar widget. This is called in gui_resize_shell(), we
+ * cannot call it in gui_set_shellsize(), because that may be called before the
+ * drawarea/formwin is resized, which may cause the drawarea to be bigger than
+ * it actually is (while the window size is up to date), causing a negative
+ * "decor_height".
+ */
+ void
+gui_gtk_init_decor_height(void)
+{
+ int h = gtk_widget_get_height(gui.mainwin);
+
+ if (h == 0)
+ return;
+
+ h -= get_menu_tool_height();
+ h -= gtk_widget_get_height(gui.formwin);
+
+ gui.decor_height = h;
+}
+
void
gui_mch_set_shellsize(int width, int height,
int min_width UNUSED, int min_height UNUSED,
@@ -824,6 +846,11 @@ gui_mch_set_shellsize(int width, int height,
{
width += get_menu_tool_width();
height += get_menu_tool_height();
+
+ // GtkWindow default size also includes client side decorations, so must
+ // include it also.
+ height += gui.decor_height;
+
gtk_window_set_default_size(GTK_WINDOW(gui.mainwin), width, height);
}

@@ -3240,24 +3267,45 @@ get_menu_tool_width(void)
int
get_menu_tool_height(void)
{
- int height = 0;
-
+ GtkWidget *widgets[] = {
#ifdef FEAT_MENU
- if (gui.menubar != NULL && gtk_widget_get_visible(gui.menubar))
- {
- GtkRequisition req;
- gtk_widget_get_preferred_size(gui.menubar, &req, NULL);
- height += req.height;
- }
+ gui.menubar,
#endif
#ifdef FEAT_TOOLBAR
- if (gui.toolbar != NULL && gtk_widget_get_visible(gui.toolbar))
+ gui.toolbar,
+#endif
+#ifdef FEAT_GUI_TABLINE
+ gui.tabline
+#endif
+ };
+
+ int height = 0;
+
+ for (int i = 0; i < ARRAY_LENGTH(widgets); i++)
{
- GtkRequisition req;
- gtk_widget_get_preferred_size(gui.toolbar, &req, NULL);
- height += req.height;
+ GtkRequisition min;
+ GtkRequisition nat;
+ int h;
+
+ if (widgets[i] == NULL || !gtk_widget_get_visible(widgets[i]))
+ continue;
+
+ h = gtk_widget_get_height(widgets[i]);
+
+ if (h == 0)
+ {
+ // Allocation hasn't been updated yet (widget just became visible).
+ // Query the preferred height so the caller gets a valid value
+ // before the layout pass runs. Use the maximum of minimum and
+ // natural height: GTK may allocate min_h even when natural_h is
+ // smaller (e.g. GtkNotebook tab bar has min_h > natural_h due to
+ // CSS).
+ gtk_widget_get_preferred_size(widgets[i], &min, &nat);
+ height += MAX(min.height, nat.height);
+ }
+ else
+ height += h;
}
-#endif
return height;
}

diff --git a/src/proto/gui_gtk4.pro b/src/proto/gui_gtk4.pro
index 10f3ccc20..4d21e6a70 100644
--- a/src/proto/gui_gtk4.pro
+++ b/src/proto/gui_gtk4.pro
@@ -19,6 +19,7 @@ void gui_mch_unmaximize(void);
void gui_mch_set_fullscreen(int flag);
void gui_mch_newfont(void);
void gui_mch_settitle(char_u *title, char_u *icon);
+void gui_gtk_init_decor_height(void);
void gui_mch_set_shellsize(int width, int height, int min_width, int min_height, int base_width, int base_height, int direction);
void gui_mch_get_screen_dimensions(int *screen_w, int *screen_h);
void gui_mch_enable_menu(int showit);
diff --git a/src/version.c b/src/version.c
index dab821ad6..b97066f50 100644
--- a/src/version.c
+++ b/src/version.c
@@ -729,6 +729,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 577,
/**/
576,
/**/