Fix Security Attributes column header width

Limit the maximum width (instead of only the minimum width), pad the
header width accordingly, and also remove extra stray spaces from the
format string (the main spacing should just come from the alignment of
the value).

Fixes #850.

Author: lucaswerkmeister

linux/LinuxProcess.c

@@ -93,7 +93,7 @@ const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
    [M_SWAP] = { .name = "M_SWAP", .title = " SWAP ", .description = "Size of the process's swapped pages", .flags = PROCESS_FLAG_LINUX_SMAPS, .defaultSortDesc = true, },
    [M_PSSWP] = { .name = "M_PSSWP", .title = " PSSWP ", .description = "shows proportional swap share of this mapping, unlike \"Swap\", this does not take into account swapped out page of underlying shmem objects", .flags = PROCESS_FLAG_LINUX_SMAPS, .defaultSortDesc = true, },
    [CTXT] = { .name = "CTXT", .title = " CTXT ", .description = "Context switches (incremental sum of voluntary_ctxt_switches and nonvoluntary_ctxt_switches)", .flags = PROCESS_FLAG_LINUX_CTXT, .defaultSortDesc = true, },
-   [SECATTR] = { .name = "SECATTR", .title = " Security Attribute ", .description = "Security attribute of the process (e.g. SELinux or AppArmor)", .flags = PROCESS_FLAG_LINUX_SECATTR, },
+   [SECATTR] = { .name = "SECATTR", .title = "Security Attribute             ", .description = "Security attribute of the process (e.g. SELinux or AppArmor)", .flags = PROCESS_FLAG_LINUX_SECATTR, },
    [PROC_COMM] = { .name = "COMM", .title = "COMM            ", .description = "comm string of the process from /proc/[pid]/comm", .flags = 0, },
    [PROC_EXE] = { .name = "EXE", .title = "EXE             ", .description = "Basename of exe of the process from /proc/[pid]/exe", .flags = 0, },
    [CWD] = { .name = "CWD", .title = "CWD                       ", .description = "The current working directory of the process", .flags = PROCESS_FLAG_CWD, },
@@ -277,7 +277,7 @@ static void LinuxProcess_writeField(const Process* this, RichString* str, Proces
       }
       xSnprintf(buffer, n, "%5lu ", lp->ctxt_diff);
       break;
-   case SECATTR: snprintf(buffer, n, "%-30s   ", lp->secattr ? lp->secattr : "?"); break;
+   case SECATTR: snprintf(buffer, n, "%-30.30s ", lp->secattr ? lp->secattr : "?"); break;
    case AUTOGROUP_ID:
       if (lp->autogroup_id != -1) {
          xSnprintf(buffer, n, "%4ld ", lp->autogroup_id);