patch 9.1.1743: Haiku: no full-screen support

Problem:  Haiku: no full-screen support
Solution: Add support for toggling full-screen using the keyboard
          (rymdbar)

Makes toggling using keyboard possible. This change does not add any
`:fullscreen` command (Which currently only macVim has).

See https://www.haiku-os.org/docs/userguide/en/keyboard-shortcuts.html
for motivation on key combination used, as well as terminology choice.
With vim being inconsistent (`:help intro` suggests <A> and <M>, while
<Alt> is used at a dozen other places) following Haiku nomenclature
seems most appropriate.

closes: #18235

Signed-off-by: rymdbar <rymdbar@x20.se>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/os_haiku.txt

@@ -1,4 +1,4 @@
-*os_haiku.txt*	For Vim version 9.1.  Last change: 2020 May 13
+*os_haiku.txt*	For Vim version 9.1.  Last change: 2025 Sep 08
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -76,6 +76,9 @@ version with GUI tries to determine if it was started from the Tracker instead
 of the Terminal, and if so, uses the GUI anyway.  However, the current detection
 scheme is fooled if you use the command "vim - </dev/null".
 
+Toggling between normal managed window and fullscreen mode can be done by
+pressing <Alt-Enter>.
+
 Stuff that does not work yet:
 
 - Mouse up events are not generated when outside the window.  You can notice
@@ -86,7 +89,9 @@ Stuff that does not work yet:
   in when the window is activated or deactivated (so it works best with focus-
   follows-mouse turned on).
 - The cursor does not flash.
-
+- Switching windows using <C-Tab-Up> and <C-Tab-Down> in Twitcher does not
+  work. This is due to each gvim window being managed by a separate instance
+  completely unaware of other vim processes.
 
 4. The $VIM directory					*haiku-vimdir*
 

runtime/doc/version9.txt

@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2025 Sep 02
+*version9.txt*  For Vim version 9.1.  Last change: 2025 Sep 08
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41619,6 +41619,8 @@ Platform specific~
 - Python3 support in OpenVMS is now available.
 
 - The Win32 GUI comes with better toolbar icons.
+
+- Better fullscreen support for Haiku |os_haiku.txt|.
 							*new-other-9.2*
 Other new features ~
 ------------------

runtime/doc/vi_diff.txt

@@ -1,4 +1,4 @@
-*vi_diff.txt*   For Vim version 9.1.  Last change: 2025 Sep 04
+*vi_diff.txt*   For Vim version 9.1.  Last change: 2025 Sep 08
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1379,13 +1379,13 @@ support is verified as part of the CI test suite.
 System				| Status:~
 --------------------------------+-----------------------------------------
 Amiga (OS4, AROS & MorphOS):	| still supported (?)
-Haiku:				| still supported (?)
+Haiku:				| supported
 Linux:				| fully supported (on maintained versions)
 Mac OS:				| fully supported up until v10.6 (?)
 MS-Windows 7, 8, 10, 11:	| fully supported
-UNIX:				| supported (on maintained versions)
 OpenVMS:			| supported
 QNX:				| still supported (?)
+UNIX:				| supported (on maintained versions)
 zOS/OS390:			| still supported (?)
 
 The following operating systems are no longer supported:

src/gui_haiku.cc

@@ -175,7 +175,7 @@ class VimWindow: public BWindow
     VimWindow();
     ~VimWindow();
 
-    //	  virtual void DispatchMessage(BMessage *m, BHandler *h);
+    virtual void DispatchMessage(BMessage *m, BHandler *h);
     virtual void WindowActivated(bool active);
     virtual bool QuitRequested();
 
@@ -184,6 +184,9 @@ class VimWindow: public BWindow
     private:
     void init();
 
+    bool is_fullscreen = false;
+    BRect saved_frame;
+    window_look saved_look;
 };
 
 class VimFormView: public BView
@@ -971,6 +974,48 @@ VimWindow::QuitRequested()
     write_port(gui.vdcmp, VimMsg::Key, &km, sizeof(km));
     return false;
 }
+    void
+VimWindow::DispatchMessage(BMessage *m, BHandler *h)
+{
+    bool should_propagate = true;
+
+    switch (m->what)
+    {
+	case B_KEY_DOWN:
+	    {
+		int32 scancode = 0;
+		int32 beModifiers = 0;
+		m->FindInt32("raw_char", &scancode);
+		m->FindInt32("modifiers", &beModifiers);
+
+		if (scancode == B_ENTER && (beModifiers & B_LEFT_COMMAND_KEY))
+		    {
+			should_propagate = false;
+			if (this->is_fullscreen)
+			    {
+				this->is_fullscreen = false;
+				ResizeTo(this->saved_frame.Width(), this->saved_frame.Height());
+				MoveTo(this->saved_frame.left, this->saved_frame.top);
+				SetLook(this->saved_look);
+				SetFlags(Flags() & ~(B_NOT_RESIZABLE | B_NOT_MOVABLE));
+			    } else {
+				this->saved_frame = Frame();
+				this->saved_look = Look();
+				this->is_fullscreen = true;
+				BScreen s(this);
+				SetLook(B_NO_BORDER_WINDOW_LOOK);
+				ResizeTo(s.Frame().Width() + 1, s.Frame().Height() + 1);
+				MoveTo(s.Frame().left, s.Frame().top);
+				SetFlags(Flags() | (B_NOT_RESIZABLE | B_NOT_MOVABLE));
+			    }
+		    }
+	    }
+    }
+
+    if (should_propagate)
+	Inherited::DispatchMessage(m, h);
+}
+
 
 // ---------------- VimFormView ----------------
 

src/version.c

@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1743,
 /**/
     1742,
 /**/