Add miscellaneous changes to i3/config

Add some unpushed changes done to i3/config before removing the config
file entirely. In particular, this commit:

- Increases the size of window borders
- Adds a command to open a floating terminal
- Makes mpv windows float by default
- Adds an option to specify the minimum and maximum sizes for floating
  windows
- Adds an easy way to show/hide floating windows ("The Hidden Workspace")
- (Re)loads polybar when starting i3

dotfiles/.config/i3/config

@@ -28,8 +28,9 @@ set $alt Mod1
 font pango:Hack 12
 
 # Add a subtle border to all windows (allows us to easily see which one has focus)
-for_window [class="^.*"] border pixel 1
-new_window pixel 1
+# Note that this used to be 1px, but changed to 10 so it's easier to see without transparency
+for_window [class="^.*"] border pixel 10
+new_window pixel 10
 
 ####################################################################
 # i3 Controls - These are the core keys that you use to manage
@@ -41,6 +42,14 @@ new_window pixel 1
 # Open a new terminal
 bindsym $mod+Return exec termite
 
+# Open a new floating terminal
+for_window [instance="Floating"] floating enable
+bindsym $mod+Shift+Return exec termite --name "Floating"
+
+# Specify a minimum and / or maximum size for floating windows
+#floating_minimum_size <width>x<height>
+#floating_maximum_size <width>x<height>
+
 # Close the currently focused window
 bindsym $mod+q          kill
 bindsym $mod+Shift+q    kill
@@ -83,6 +92,8 @@ bindsym $mod+space focus mode_toggle
 
 for_window [class="^feh$"] floating enable
 for_window [instance="^feh$"] floating enable
+for_window [class="^mpv$"] floating enable
+for_window [instance="^mpv$"] floating enable
 
 # ========================= Workspaces ========================= 
 
@@ -139,6 +150,18 @@ mode "resize" {
 # Keybinding to enter resize mode
 bindsym $mod+r mode "resize"
 
+# ========================= The Hidden Workspace =========================
+
+# Move the current window to the hidden workspace
+bindsym $mod+t move scratchpad
+
+# Toggle between showing and hiding windows from the hidden workspace
+bindsym $mod+i scratchpad show
+
+# Toggle program-specific windows
+# Note that the program must be started with e.g. termite --name "cmus"
+#bindsym $mod+c [instance="cmus"] scratchpad show
+
 # ========================= Lock Screen ========================= 
 
 # Add a keybinding to instantly lock the screen
@@ -222,4 +245,7 @@ client.focused_inactive $unfocused  $unfocused  $text   $unfocused
 client.unfocused        $unfocused  $unfocused  $text   $unfocused
 client.urgent           $urgent     $urgent     $text   $urgent
 
+# (Re)load polybar when starting i3
+exec_always --no-startup-id $HOME/.config/polybar/launch.sh
+
 # vim:ft=dosini