UI: Save Temp Window Sizes & Positions

Allow temporary windows (like File Browser, Preferences, Render,
Drivers, Info) to open at their last positions and sizes.

Pull Request: https://projects.blender.org/blender/blender/pulls/104727

intern/ghost/GHOST_Types.h

@@ -178,6 +178,10 @@ typedef enum {
    * Setting cursors via #GHOST_SetCursorGenerator is supported.
    */
   GHOST_kCapabilityCursorGenerator = (1 << 11),
+  /**
+   * Support accurately placing windows on multiple monitors.
+   */
+  GHOST_kCapabilityMultiMonitorPlacement = (1 << 12),
 
 } GHOST_TCapabilityFlag;
 
@@ -191,7 +195,7 @@ typedef enum {
    GHOST_kCapabilityClipboardImage | GHOST_kCapabilityDesktopSample | GHOST_kCapabilityInputIME | \
    GHOST_kCapabilityTrackpadPhysicalDirection | GHOST_kCapabilityWindowDecorationStyles | \
    GHOST_kCapabilityKeyboardHyperKey | GHOST_kCapabilityCursorRGBA | \
-   GHOST_kCapabilityCursorGenerator)
+   GHOST_kCapabilityCursorGenerator | GHOST_kCapabilityMultiMonitorPlacement)
 
 /* Xtilt and Ytilt represent how much the pen is tilted away from
  * vertically upright in either the X or Y direction, with X and Y the

intern/ghost/intern/GHOST_SystemHeadless.hh

@@ -76,7 +76,9 @@ class GHOST_SystemHeadless : public GHOST_System {
             /* Wrap. */
             GHOST_kCapabilityCursorRGBA |
             /* Wrap. */
-            GHOST_kCapabilityCursorGenerator)
+            GHOST_kCapabilityCursorGenerator |
+            /* Wrap. */
+            GHOST_kCapabilityMultiMonitorPlacement)
 
     );
   }

intern/ghost/intern/GHOST_SystemSDL.cc

@@ -801,6 +801,8 @@ GHOST_TCapabilityFlag GHOST_SystemSDL::getCapabilities() const
           GHOST_kCapabilityInputIME |
           /* No support for window decoration styles. */
           GHOST_kCapabilityWindowDecorationStyles |
+          /* No support for precisely placing windows on multiple monitors. */
+          GHOST_kCapabilityMultiMonitorPlacement |
           /* No support for a Hyper modifier key. */
           GHOST_kCapabilityKeyboardHyperKey |
           /* No support yet for RGBA mouse cursors. */

intern/ghost/intern/GHOST_SystemWayland.cc

@@ -9074,6 +9074,8 @@ GHOST_TCapabilityFlag GHOST_SystemWayland::getCapabilities() const
       ~(
           /* WAYLAND doesn't support accessing the window position. */
           GHOST_kCapabilityWindowPosition |
+          /* WAYLAND cannot precisely place windows among multiple monitors. */
+          GHOST_kCapabilityMultiMonitorPlacement |
           /* WAYLAND doesn't support setting the cursor position directly,
            * this is an intentional choice, forcing us to use a software cursor in this case. */
           GHOST_kCapabilityCursorWarp |