Offiline map download doesn't work for large viewport
- /e/OS version:
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- Impacted Application: ~
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## The problem
**Describe precisely the problem you're facing and add screenshots to illustrate**
When I've select large viewport (~ >6505 tiles) for offline map download, the `dowload current viewport` doesn't do anything after click. As a User, I would like to download a large location data (ex: for a whole country) for offline map support. If that is not possible, I would like to see a alert saying `not possible to download this big data`. (P.S: tested area: country: Bangladesh, city: Dhaka)
Another small point: download offline map is not very intuitive as end-user perspective. User might expect a list of country to download the offline map data.
**Steps to reproduce**
## Technical details
**Paste any relevant logs (`adb logcat`) in the codeblock below if you have any**
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