Currently, the keyboard client is created and the input
panel surface is set as toplevel on the first output it
finds. This does not work in a scenario when there are
no outputs, resulting in weston-keyboard to crash at
startup due to operating on an invalid output pointer.

This makes input panel toplevel setting depend on a
valid output, and if there was no output present at
startup, it will be set toplevel as soon as an output
gets plugged in.

v2:

- Remove dependency on output pointer at startup
- Only setup output_configure_handler after the
  keyboard has been created
- Let the output_configure_handler handle toplevel
  setting in all cases

Signed-off-by: Armin Krezović <krezovic.ar...@gmail.com>
---
 clients/keyboard.c | 42 ++++++++++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/clients/keyboard.c b/clients/keyboard.c
index d719764..83082ad 100644
--- a/clients/keyboard.c
+++ b/clients/keyboard.c
@@ -24,6 +24,7 @@
 
 #include "config.h"
 
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -56,6 +57,7 @@ struct virtual_keyboard {
        char *surrounding_text;
        uint32_t surrounding_cursor;
        struct keyboard *keyboard;
+       bool toplevel;
 };
 
 enum key_type {
@@ -953,11 +955,34 @@ global_handler(struct display *display, uint32_t name,
 }
 
 static void
-keyboard_create(struct output *output, struct virtual_keyboard 
*virtual_keyboard)
+set_toplevel(struct output *output, struct virtual_keyboard *virtual_keyboard)
+{
+       struct zwp_input_panel_surface_v1 *ips;
+       struct keyboard *keyboard = virtual_keyboard->keyboard;
+
+       ips = 
zwp_input_panel_v1_get_input_panel_surface(virtual_keyboard->input_panel,
+                                                        
window_get_wl_surface(keyboard->window));
+
+       zwp_input_panel_surface_v1_set_toplevel(ips,
+                                               output_get_wl_output(output),
+                                               
ZWP_INPUT_PANEL_SURFACE_V1_POSITION_CENTER_BOTTOM);
+
+       virtual_keyboard->toplevel = true;
+}
+
+static
+void display_output_handler(struct output *output, void *data) {
+       struct virtual_keyboard *keyboard = data;
+
+       if (!keyboard->toplevel)
+               set_toplevel(output, keyboard);
+}
+
+static void
+keyboard_create(struct virtual_keyboard *virtual_keyboard)
 {
        struct keyboard *keyboard;
        const struct layout *layout;
-       struct zwp_input_panel_surface_v1 *ips;
 
        layout = get_current_layout(virtual_keyboard);
 
@@ -981,20 +1006,14 @@ keyboard_create(struct output *output, struct 
virtual_keyboard *virtual_keyboard
                               layout->columns * key_width,
                               layout->rows * key_height);
 
-
-       ips = 
zwp_input_panel_v1_get_input_panel_surface(virtual_keyboard->input_panel,
-                                                        
window_get_wl_surface(keyboard->window));
-
-       zwp_input_panel_surface_v1_set_toplevel(ips,
-                                               output_get_wl_output(output),
-                                               
ZWP_INPUT_PANEL_SURFACE_V1_POSITION_CENTER_BOTTOM);
+       display_set_output_configure_handler(virtual_keyboard->display,
+                                            display_output_handler);
 }
 
 int
 main(int argc, char *argv[])
 {
        struct virtual_keyboard virtual_keyboard;
-       struct output *output;
 
        memset(&virtual_keyboard, 0, sizeof virtual_keyboard);
 
@@ -1012,8 +1031,7 @@ main(int argc, char *argv[])
                return -1;
        }
 
-       output = display_get_output(virtual_keyboard.display);
-       keyboard_create(output, &virtual_keyboard);
+       keyboard_create(&virtual_keyboard);
 
        display_run(virtual_keyboard.display);
 
-- 
2.9.0

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