Don't close dialogs when a drag ends on the backdrop (#202)

Only close a dialog or command dialog on backdrop click when the press
also started on the backdrop, so selecting text inside and releasing
outside no longer closes it.

Co-authored-by: PhilipdeRijk <derijk.pjtm@gmail.com>

src/templates/jinja/command.html.jinja

@@ -98,7 +98,7 @@
   class="command-dialog {{ dialog_attrs.class | default('') }}"
   aria-label="Command menu"
   {% if open %}open{% endif %}
-  onclick="if (event.target === this) this.close()"
+  onpointerdown="this.dataset.backdropPress = event.target === this" onclick="if (event.target === this && this.dataset.backdropPress === 'true') this.close()"
   {% for key, value in dialog_attrs.items() %}
     {% if key != 'class' %}{{ key }}="{{ value }}"{% endif %}
   {% endfor %}

src/templates/jinja/dialog.html.jinja

@@ -53,7 +53,7 @@
   {% if title %}aria-labelledby="{{ id }}-title"{% endif %}
   {% if description %}aria-describedby="{{ id }}-description"{% endif %}
   {% if open %}open{% endif %}
-  {% if close_on_overlay_click %}onclick="if (event.target === this) this.close()"{% endif %}
+  {% if close_on_overlay_click %}onpointerdown="this.dataset.backdropPress = event.target === this" onclick="if (event.target === this && this.dataset.backdropPress === 'true') this.close()"{% endif %}
   {% for key, value in dialog_attrs.items() %}
     {% if key != 'class' %}{{ key }}="{{ value }}"{% endif %}
   {% endfor %}

src/templates/nunjucks/command.njk

@@ -92,7 +92,7 @@
   class="command-dialog {{ dialog_attrs.class }}"
   aria-label="Command menu"
   {% if open %}open{% endif %}
-  onclick="if (event.target === this) this.close()"
+  onpointerdown="this.dataset.backdropPress = event.target === this" onclick="if (event.target === this && this.dataset.backdropPress === 'true') this.close()"
   {% for key, value in dialog_attrs %}
     {% if key != 'class' %}{{ key }}="{{ value }}"{% endif %}
   {% endfor %}

src/templates/nunjucks/dialog.njk

@@ -48,7 +48,7 @@
   {% if title %}aria-labelledby="{{ id }}-title"{% endif %}
   {% if description %}aria-describedby="{{ id }}-description"{% endif %}
   {% if open %}open{% endif %}
-  {% if close_on_overlay_click %}onclick="if (event.target === this) this.close()"{% endif %}
+  {% if close_on_overlay_click %}onpointerdown="this.dataset.backdropPress = event.target === this" onclick="if (event.target === this && this.dataset.backdropPress === 'true') this.close()"{% endif %}
   {% for key, value in dialog_attrs %}
     {% if key != 'class' %}{{ key }}="{{ value }}"{% endif %}
   {% endfor %}