Previously, the only way to select all the module labels was with the
following kind of selector:
```css
.modules-left > widget > label,
.modules-center > widget > label,
.modules-right > widget > label {
/* ... */
}
```
(and a matching block for the `box` containers).
Now, this can be expressed as
```css
label.module, box.module {
/* ... */
}
```
This reverts commit 2d33c20231 and
reapplies various patches for memory leaks.
The reason for the revert was a bug for a maximum duration interval
which caused sleep_for() to cause unpredictable behavior.
Adding support for middle, backward, and forward mouse buttons click events, adds config keys : "on-click-middle", "on-click-forward" and "on-click-backward"
Adding the key "format-alt-click" to choose what mouse clicks toggles the alternative format, when present. Possible values (in config): "click-right", "click-left", "click-middle", "click-forward", "click-backward". Other values have the same effect than "click-left". Previous behaviour was to toggle it whenever any click was registered and any click that was not handled by "on-click-right" or "on-click-left" occurred
This patch adds 3 new configuration options applicable for
subclasses of ALabel. The options can be used to execute
user defined code in response to the 3 mouse events:
* on-click: The left mouse button click
* on-scroll-up
* on-scroll-down
This patch also modifies the behaviour of the format-alt toggle
such that when the on-click event is configured, format-alt is
toggled on any mouse click other than left click. When on-click
is not defined, any mouse button would toggle format-alt.
Signed-off-by: Harish Krupo <harishkrupo@gmail.com>