Documentation: Add lever handling instructions to help

[hbeni]

In #1498 we talked about where to add the help information about the new lever usage options (alt and shift modes), but couldn't decide yet.
In order to not overlook this, we decided to track this in a new ticket.
Here it is :)

---

Hm, or maybe directly at the tooltip? Or just the wiki?

I tried adding it at the help gui, but that looked not so good.

i don't know how you added it but i was thinking of something like this...

but with better wording than i show here... maybe also with a divider line below this new section to separate it from the checklist line...

i whipped this up with the following...

diff --git a/c172-help.xml b/c172-help.xml
index f55b7a57..bb35528d 100644
--- a/c172-help.xml
+++ b/c172-help.xml
@@ -79,6 +79,13 @@
         <desc>Reset view</desc>
     </key>
 
+    <line/>
+    <line>to adjust throttle and mixture, drag or mousewheel on them.</line>
+    <line>using no modifier keys, they will move at a rate of 5% of their total length.</line>
+    <line>using SHIFT, they will move at a rate of 10% of their total length.</line>
+    <line>using ALT, they will move at a rate of 1% of their total length.</line>
+    <line>using SHIFT and ALT, they will move at double the ALT rate.</line>
+
     <line/>
     <line>For checklists, see under Help-&gt;Aircraft Checklists</line>
     <line/>

maybe use leading dashes on each of the "using [...]" lines so it looks like an unordered list would help, too...

also, perhaps this may be a nice feature to add to the air vent (top left of windshield), cabin heat, and cabin air (both on bottom right of dashboard) as well? i think that's all the sliding controls, isn't it?

Originally posted by @wkitty42 in #1498 (comment)

[wkitty42]

i'm glad you saved that and made a new issue so it is easier to track... thanks!