Clicking on a room border should select the closest room.

[ZookaOnGit]

Brief summary of issue / Description of requested feature:

Clicking on a white/grey line in this picture doesn't pick a neighbouring room (it deselects everything like clicking in blank space) even with "Rooms: 10" chosen. So when you zoom out on a very large map and try to select a point on the map you get nothing selected quite frequently.

Setting room borders to off doesn't seem to assist the selection.

Steps to reproduce the issue / Reasons for adding feature:

1. Make a huge map (1000x1000 room supplied) 1000x1000-mudlet-map.tar.gz
2. Zoom out so you can see it all and click around the area.
3. You will notice that rooms aren't always selected, but are deselected like clicking on blank map space.

Error output / Expected result of feature

Clicking on a room border would choose the closest room match.

Extra information, such as the Mudlet version, operating system and ideas for how to solve / implement:

https://discord.com/channels/283581582550237184/1215109133150199889/1216222444587581450

[ZookaOnGit]

Here are the environment colours used in the above map.

local GREEN1,GREEN2,GREEN3,GREEN4,GREEN5,GREEN6,GREEN7,GREEN8,GREEN9 = 300,301,302,303,304,305,306,307,308,309
setCustomEnvColor(GREEN9,247,252,245,255)
setCustomEnvColor(GREEN8,229,245,224,255)
setCustomEnvColor(GREEN7,199,233,192,255)
setCustomEnvColor(GREEN6,161,217,155,255)
setCustomEnvColor(GREEN5,116,196,118,255)
setCustomEnvColor(GREEN4,65,171,93,255)
setCustomEnvColor(GREEN3,35,139,69,255)
setCustomEnvColor(GREEN2,0,109,44,255)
setCustomEnvColor(GREEN1,0,68,27,255)

local BLUE1,BLUE2,BLUE3,BLUE4,BLUE5,BLUE6,BLUE7,BLUE8,BLUE9 = 400,401,402,403,404,405,406,407,408,409
setCustomEnvColor(BLUE9,247,251,255,255)
setCustomEnvColor(BLUE8,222,235,247,255)
setCustomEnvColor(BLUE7,198,219,239,255)
setCustomEnvColor(BLUE6,158,202,225,255)
setCustomEnvColor(BLUE5,107,174,214,255)
setCustomEnvColor(BLUE4,66,146,198,255)
setCustomEnvColor(BLUE3,33,113,181,255)
setCustomEnvColor(BLUE2,8,81,156,255)
setCustomEnvColor(BLUE1,8,48,107,255)